Simple answer is yes as Helinut said. A lot of flying in helicopters is IMC in class G airspace.
For example you can take off from Southend, go IMC to MSA, flog aroung the Heathrow control zone and do an ILS in to Farnborough, all class G but 100ft below class A.
There are quite a few places that have no radar so you are expected to fly the procedure, usually a nearby radar service can look out for you for a large chunk of the approach but not always.
Pretty sure ATC is a minimum requirment in the UK, probably all over JAA/ EASA land but nobody bothered telling some places on the continent which is a good thing as they leave the ILS on when they go for a three hour lunch, at least you can get down.